Alan, Tin-Tin, Lady Penelope and Parker represent International Rescue on Skyship One's round-the-world maiden flight, unaware that criminal mastermind The Hood is once again plotting to acquire the secrets of the Thunderbird machines. Paid agents of the Hood murder the original crew of Skyship One prior to take-off and assume their identities, entertaining the guests while scheming to lure the Tracy brothers into a trap. Meanwhile, Brains' efforts to produce a satisfactory design concept for Jeff's proposed Thunderbird 6 collide with fate when Skyship One is damaged and Alan's old Tiger Moth biplane appears to be the only hope of saving the International Rescue group and their impostor hosts.

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